Education
He was graduated at the gymnasium Katharineum in Lübeck in 1841, and in 1853 came to the United States.
He was graduated at the gymnasium Katharineum in Lübeck in 1841, and in 1853 came to the United States.
He settled in California, where he became a recognized authority on entomology, in particular Lepidoptera.
Behrens contributed papers to scientific journals, and was a member of many scientific societies in the United States and Europe.